Delete row sig_1f59621ec206 from signals

id sig_1f59621ec206
event_id evt_01faf6df6998
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_db03c14c1 ...
dedupe_key signal_enriched:news_delta:f049589159fd5b63
throttle_s 0
created_at 2026-04-09T12:52:05.860261+00:00
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